Biostable Semi-Synthetic Metal Cutting Coolant
High-lubricity micro-emulsion cutting fluid formulated with synthetic esters and biostable amine chemistry, engineered for high-pressure through-spindle cooling up to 70 bar with zero foaming and extended sump life over 12 months.
Tribological Standard Definition & Engineering Direct Answer
FOSS Biostable Semi-Synthetic Metal Cutting Fluid is a versatile water-miscible coolant formulated from hydrotreated mineral base oils, synthetic ester lubricity enhancers, and advanced boric-acid-free secondary amine biostabilizers. Formulated to resist microbial degradation without relying on formaldehyde donors or chlorinated extreme-pressure additives, it passes ASTM D4627 cast iron chip corrosion testing at concentrations as low as 4.0%. The concentrate forms a translucent micro-emulsion when mixed with tap water (hardness 50 to 500 ppm CaCO3), offering an optimal working pH range of 8.8 to 9.2. It suppresses foam even under high-pressure through-spindle coolant delivery (up to 70 bar), preventing thermal shock on solid carbide tooling. Ideal for 5-axis CNC machining, milling, drilling, and tapping of 6061/7075 aluminum alloys, carbon steels, and 304/316 stainless steels. Sump life consistently exceeds 12 months with routine refractometer monitoring. Supplied in UN 208L steel drums and 1,000L IBC totes.
Verified 208L Steel Drum Staging & Container Loading Bay
Photographic evidence from our Quanzhou plant floor and export container stuffing bay. Every batch is blended via automated mass-flow metering, sealed with waterproof tamper-evident bungs, and labeled with full batch test certificates.
Concentrate & Emulsion Technical Properties
Every batch blended at our Quanzhou plant is certified against international testing standards before filling into UN 208L steel drums.
| Test Parameter | Test Method | Typical Value | Operating Target |
|---|---|---|---|
| Appearance (Concentrate) | Visual | Amber clear liquid | Homogeneous, clear |
| Appearance (5% Emulsion) | Visual | Translucent micro-emulsion | Slight blue haze |
| Density @ 20°C (g/cm³) | ASTM D1298 | 1.02 | 1.01 - 1.04 |
| pH @ 5% Emulsion (in DI water) | ASTM E70 | 9.1 | 8.8 - 9.4 |
| Refractometer Brix Multiplier | Optical Brix | 1.1 | Brix × 1.1 = Conc. % |
| Cast Iron Chip Corrosion (5% in water) | ASTM D4627 | 0 (No rust) | 0 rating required |
| Foam Height (5% @ 70 bar pressure) | Internal Test | < 10 mm (breaks in 5s) | Zero stable foam |
| Copper Corrosion Test | ASTM D130 | 1b | Non-staining on yellow metals |
Recommended Dilution Ratios & Machining Operations
Engineered specifically for high-stress industrial machinery, minimizing friction coefficients and extending component service life.
Aluminum Alloy High-Speed Milling
5% to 7% dilution ratio (Brix 4.5 - 6.4) prevents built-up edge (BUE) on carbide cutters and delivers mirror surface finish.
Stainless Steel Tapping & Drilling
8% to 10% dilution ratio (Brix 7.3 - 9.1) provides extreme hydrodynamic boundary lubrication to prevent tool seizing.
Cast Iron Milling & Turning
5% to 6% dilution ratio provides rapid wetting and flushing of graphite fines without sticky residue or bacterial odor.
Surface & Cylindrical Grinding
3% to 4% dilution ratio guarantees maximum cooling rate and rapid wheel self-cleaning without glazing.
Sump Hygiene & Lab Verification Standards
Strict five-stage quality checkpoint from raw base oil tank unloading to finished drum sealing.
Boric Acid & Formaldehyde-Free
Complies strictly with REACH and RoHS standards, protecting operator skin from contact dermatitis.
Rapid Tramp Oil Rejection
Demulsifies slideway oil within 2 hours, allowing 99% tramp oil recovery via disc or belt skimmers.
Hard Water Stability Testing
Maintains emulsion stability in hard water up to 600 ppm without oil splitting or cream layer formation.
Batch Antimicrobial Challenge
ASTM D3946 challenge tests confirm zero bacterial or fungal colonies after 120 days of simulated stagnation.
Export Packaging, Palletization & Container Loadability
Supplied in standard UN 1A1 cold-rolled steel 208L drums (80 drums per 20GP container = 16,640 liters) and 1,000L IBC totes (18-20 totes per 20GP container).
Frequently Asked Technical & Procurement Questions
Clarifications on viscosity grades, synthetic formulations, oil drain intervals, and container freight.
How do I calculate the actual cutting fluid concentration using a handheld refractometer?
Will this fluid stain aluminum workpieces if left unwashed?
What is the typical working life before needing a complete tank dump?
Request Direct Factory Quotation & Technical Dossier
Receive competitive FOB Xiamen / CIF port container pricing, batch Certificate of Analysis (CoA), and sample dispatch confirmation.